CN115592800A - Construction method for bottom die of precast concrete structure - Google Patents
Construction method for bottom die of precast concrete structure Download PDFInfo
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- CN115592800A CN115592800A CN202211524270.3A CN202211524270A CN115592800A CN 115592800 A CN115592800 A CN 115592800A CN 202211524270 A CN202211524270 A CN 202211524270A CN 115592800 A CN115592800 A CN 115592800A
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- concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/07—Tunnels or shuttering therefor preconstructed as a whole or continuously made, and moved into place on the water-bed, e.g. into a preformed trench
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Abstract
A construction method of a bottom die of a precast concrete structure comprises the following steps: s1, pouring a concrete bottom plate and a reserved groove; s2, burying broken stones in the grooves and paving a bamboo rubber plate; s3, paving oil felt paper and kraft paper; s4, placing a cushion block, laying fireproof cloth and binding steel bars; s5, drawing out the fireproof cloth, erecting the template and pouring concrete; s6, injecting water into the dock, floating the prefabricated structure, transporting and installing; the construction method can meet the requirement of the flatness of the concrete bottom plate, the bamboo rubber plate is laid on the bottom plate, the prefabricated concrete structure is effectively prevented from being adhered to the concrete of the bottom plate, the sinking pipe is prevented from floating, the bamboo rubber plate is damaged and convenient to replace, the maintenance cost is low, and the prefabrication process is simple and convenient to construct and operate and low in construction cost.
Description
Technical Field
The invention relates to the technical field of concrete bottom die construction, in particular to a bottom die construction method for a precast concrete structure.
Background
The dry dock scheme is generally adopted for prefabricating a submarine tunnel immersed tube section, a dry construction environment is formed in a dock, the immersed tube section is prefabricated on a dry dock bottom plate, water is placed in the dry dock after the immersed tube is prefabricated, the immersed tube floats up, the immersed tube section is transported out of the dock in a floating mode, the flatness requirement of the dock bottom plate is very high, otherwise, the requirement of high flatness of concrete at the bottom of the immersed tube cannot be met, the prefabrication quality of the immersed tube is influenced, the immersed tube can be smoothly floated after the immersed tube is poured in the dock, the immersed tube cannot be bonded with the concrete at the bottom, the existing immersed tube prefabrication scheme in the immersed tube dock is a steel template like an immersed tube prefabrication bottom plate in a ball dock Australian bridge, and the construction cost and the maintenance cost after the bottom plate is damaged are high.
Disclosure of Invention
The invention provides a bottom die construction method of a precast concrete structure for solving the problems so as to ensure the flatness of the bottom of an immersed tube and the smooth floating of the immersed tube and reduce the construction cost and the maintenance cost.
The technical scheme adopted by the invention is as follows:
a construction method of a bottom die of a precast concrete structure comprises the following steps:
s1, pouring a concrete bottom plate and a reserved groove:
firstly, excavating a foundation trench to a designed elevation, then pouring bottom plate concrete, reserving a trench, strictly controlling the top elevation of the bottom plate concrete, and maintaining the bottom plate concrete in a heat preservation and moisture preservation manner; measuring and checking by adopting a grid encryption method, rechecking the actual elevation of the bottom plate concrete, and marking and eliminating the defects of the bottom plate concrete in the range which does not meet the elevation requirement to ensure that the actual deviation meets the design requirement;
s2, embedding broken stones in the groove, and paving a bamboo rubber plate:
burying graded broken stones in a groove reserved in the bottom plate concrete; then laying a bamboo plywood in a construction area of the prefabricated structure, fixing the bamboo plywood on the bottom plate concrete by adopting expansion screws and gaskets, firmly fixing the expansion screws at certain intervals, and sticking the joints of the bamboo plywood by using adhesive tapes;
s3, paving oil felt paper and kraft paper:
paving felt base paper on the bamboo plywood, adopting adhesive tape to paste the seams, paving a layer of kraft paper on the felt base paper, and also using the adhesive tape to paste;
s4, placing a cushion block, laying fireproof cloth and binding steel bars:
positioning, paying off and placing concrete cushion blocks, laying fireproof cloth between the concrete cushion blocks in a full-length mode, and then performing binding and welding operation on main structure steel bars;
s5, drawing out the fireproof cloth, erecting the template and pouring concrete:
after the binding operation of the main structure steel bars is finished and before the side mold is erected, the fireproof cloth is completely drawn out from the bottom; then erecting a main body structure side mold, and carrying out main body structure concrete construction in a layered manner;
s6, water injection in the dock, floating of the prefabricated structure, shipment and installation:
after a batch of prefabricated concrete structures are finished, injecting water into the dock, then checking the water seepage of the prefabricated structures in real time and plugging, and checking the bonding and flatness conditions of the bamboo plywood at the bottom; and after the water levels inside and outside the dock are flush, the prefabricated concrete structure is carried to the installation position by adopting a tugboat for installation and construction.
And in the step S2, the top elevation of the crushed stone paved in the groove is not higher than the top elevation of the bottom plate.
And in the step S3, staggered paving is carried out between two layers of the felt base paper and between the felt base paper and kraft paper.
In the step S5, after the fireproof cloth is drawn out, the kraft paper needs to be repaired when the kraft paper is found to be damaged.
And S6, when the bonding condition of the bamboo plywood at the bottom is checked after the prefabricated concrete structure floats, if the bamboo plywood is adhered to the site, cleaning in time is needed.
The thickness of the bamboo plywood paved in the step S2 is 1.5cm.
And in the S4 step, positioning and paying off are carried out to place concrete cushion blocks, and the distance between the concrete cushion blocks is 1m.
The invention has the beneficial effects that: the construction method can meet the requirement of the flatness of the concrete bottom plate, the bamboo rubber plate is laid on the bottom plate, the prefabricated concrete structure is effectively prevented from being adhered to the concrete of the bottom plate, the sinking pipe is prevented from floating, the bamboo rubber plate is damaged and convenient to replace, the maintenance cost is low, and the prefabrication process is simple and convenient to construct and operate and low in construction cost.
Drawings
Fig. 1 is a schematic view of laying a bottom mold of a precast concrete structure according to the present invention.
Fig. 2 is a schematic view illustrating the construction of the precast concrete structure body according to the present invention.
Wherein: 1-floor concrete; 2-a groove; 3-bamboo plywood; 4-expansion screw; 5-linoleum base paper; 6-kraft paper; 7-fireproof cloth; 8-concrete cushion blocks; 9-main body structural steel bars; 10-main structure concrete.
Detailed Description
A construction method of a bottom die of a precast concrete structure comprises the following steps:
s1, pouring a concrete bottom plate and a reserved groove:
firstly, excavating a foundation trench to a designed elevation, then pouring bottom plate concrete 1, reserving a trench 2, strictly controlling the top elevation of the bottom plate concrete 1, and maintaining the bottom plate concrete in a heat-preservation and moisture-preservation manner; measuring and checking by adopting a grid encryption method, rechecking the actual elevation of the bottom plate concrete 1, and marking and eliminating defects of the bottom plate concrete 1 which does not meet the range of elevation requirements to ensure that the actual deviation meets the design requirements;
s2, embedding broken stones in the groove, and paving a bamboo rubber plate:
burying graded broken stones in a groove 2 reserved in the bottom plate concrete 1; then laying a bamboo plywood 3 in a construction area of the prefabricated structure, fixing the bamboo plywood 3 on the bottom plate concrete 1 by adopting expansion screws 4 and gaskets, fixing the expansion screws 4 firmly at certain intervals, and sticking the joints of the bamboo plywood 3 by using adhesive tapes;
s3, paving oil felt paper and kraft paper:
paving asphalt felt base paper 5 on the bamboo plywood 3, pasting the seams by using adhesive tapes, paving a layer of kraft paper 6 on the asphalt felt base paper 5, and pasting by using the adhesive tapes;
s4, placing a cushion block, laying fireproof cloth and binding steel bars:
positioning, paying off and placing concrete cushion blocks 8, laying fireproof cloth 7 in a through length mode between the concrete cushion blocks 8, and then binding and welding main structural steel bars 9;
s5, drawing out the fireproof cloth, erecting the template and pouring concrete:
after the binding operation of the main structure steel bars 9 is finished and before the side mold is erected, the fireproof cloth 7 is completely drawn out from the bottom; then erecting the main structure side mold, and constructing the main structure concrete 10 layer by layer;
s6, water injection in the dock, floating of the prefabricated structure, shipment and installation:
after a batch of prefabricated concrete structures are finished, injecting water into the dock, then checking the water seepage and plugging treatment of the prefabricated structures in real time, and checking the bonding and flatness conditions of the bamboo plywood 3 at the bottom; and after the water levels inside and outside the dock are flush, the prefabricated concrete structure is carried to the installation position by adopting a tugboat for installation and construction.
Example 1
Taking the construction situation of the bottom die of the prefabricated immersed tube of the large connecting bay submarine tunnel as an example, the immersed tube of the large connecting bay submarine tunnel is prefabricated in a dry dock and is of a reinforced concrete structure with two holes and one pipe gallery, the length is 180m, the width is 33.4m, the height is 9.7m, the thickness of a bottom plate is 1.4m, the thickness of a side wall is 1.25m, the thickness of a top plate is 1.4m, the thickness of an intermediate wall is 0.6m, the prefabrication process of the domestic first dry dock method is adopted, and the bottom die construction method is firstly used in China.
The construction quality requirement is as follows: the flatness of the cast-in-place concrete bottom plate must meet the design requirements, graded broken stones are filled in the grooves, the bamboo plywood is firmly fixed by expansion screws, the bamboo plywood, the linoleum base paper and kraft paper are laid smoothly, gaps are firmly bonded by adhesive tapes, and the cast-in-place concrete bottom plate has no phenomena of fluctuation, curling and damage; after the immersed tube floats, whether the adhesion phenomenon of the bamboo plywood exists at the bottom of the immersed tube joint needs to be checked, and if the adhesion phenomenon exists, the immersed tube joint needs to be cleaned in time.
A construction method of a bottom die of a precast concrete structure comprises the following steps:
s1, pouring a concrete bottom plate and a reserved groove:
firstly, excavating a foundation trench to a designed elevation, then pouring bottom plate concrete 1, reserving a trench 2, strictly controlling the top elevation of the bottom plate concrete 1, controlling the elevation within +/-5 cm, and carrying out heat preservation, moisture preservation and maintenance; measuring and accepting by adopting a grid encryption method, rechecking the actual elevation of the bottom plate concrete 1, and marking and eliminating the defects of the bottom plate concrete 1 which does not meet the range of elevation requirements to ensure that the actual deviation meets the design requirements;
s2, embedding broken stones in the groove, and paving a bamboo rubber plate:
burying graded broken stones in a groove 2 reserved in the bottom plate concrete 1; then laying a bamboo plywood 3 with the thickness of 1.5cm in a construction area of the prefabricated structure, fixing the bamboo plywood 3 on the bottom plate concrete 1 by adopting expansion screws 4 and gaskets, firmly fixing the expansion screws 4 at certain intervals of 1m, and sticking the joints of the bamboo plywood 3 by using adhesive tapes;
s3, paving oil felt paper and kraft paper:
paving asphalt felt base paper 5 on the bamboo plywood 3, adopting adhesive tape to paste seams, paving a layer of kraft paper 6 on the asphalt felt base paper 5, also using adhesive tape to paste, and paving adjacent asphalt felt base paper 5 and kraft paper 6 at staggered seams;
s4, placing a cushion block, laying fireproof cloth and binding steel bars:
positioning, paying off and placing concrete cushion blocks 8, wherein the distance between the concrete cushion blocks 8 is 1m, laying fireproof cloth 7 in the same direction and in the same length between the concrete cushion blocks 8, and then binding and welding the immersed tube main structure steel bars;
s5, drawing out the fireproof cloth, erecting the template and pouring concrete:
after the immersed tube steel bar binding operation is finished and before the side mold is erected, the fireproof cloth 7 is completely drawn out from the bottom; then erecting the immersed tube side mold, and constructing the main structure concrete 10 in layers;
s6, water injection in the dock, floating of the prefabricated structure, shipment and installation:
accomplish a batch concrete prefabrication after, to the intramural water injection of depressed place, then inside infiltration of real-time check immersed tube and shutoff are handled to send dive personnel to inspect the 3 bonding condition of immersed tube bottom bamboo plywood, if there is the bonding condition, need adopt high-pressure squirt clean up, behind the water level parallel and level in the depressed place, adopt the installation ship to consign the immersed tube to mounted position and carry out the construction.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. A construction method of a bottom die of a precast concrete structure is characterized by comprising the following steps:
s1, pouring a concrete bottom plate and a reserved groove:
firstly, excavating a foundation trench to a designed elevation, then pouring bottom plate concrete (1), reserving a trench (2), strictly controlling the top elevation of the bottom plate concrete (1), and maintaining heat preservation and moisture preservation; measuring and accepting by adopting a grid encryption method, rechecking the actual elevation of the bottom plate concrete (1), and marking and eliminating the bottom plate concrete (1) which does not meet the range of elevation requirements to ensure that the actual deviation meets the design requirements;
s2, embedding broken stones in the groove, and paving a bamboo rubber plate:
burying graded broken stones in a groove (2) reserved in the bottom plate concrete (1); then laying a bamboo plywood (3) in a construction area of the prefabricated structure, fixing the bamboo plywood (3) on the bottom plate concrete (1) by adopting expansion screws (4) and gaskets, firmly fixing the expansion screws (4) at certain intervals, and sticking the abutted seams of the bamboo plywood (3) by using adhesive tapes;
s3, paving oil felt paper and kraft paper:
paving asphalt felt base paper (5) on the bamboo plywood (3), pasting the seams by using an adhesive tape, paving a layer of kraft paper (6) on the asphalt felt base paper (5), and pasting by using the adhesive tape;
s4, placing a cushion block, laying fireproof cloth and binding steel bars:
positioning, paying off, placing concrete cushion blocks (8), laying fireproof cloth (7) between the concrete cushion blocks (8) in a through-length mode, and then binding and welding main structural steel bars (9);
s5, drawing out the fireproof cloth, erecting the template and pouring concrete:
after the binding operation of the main structure steel bars (9) is finished and before the side mold is erected, the fireproof cloth (7) is completely drawn out from the bottom; then erecting the main structure side mold, and constructing the main structure concrete (10) layer by layer;
s6, water injection in the dock, floating of the prefabricated structure, shipment and installation:
after a batch of prefabricated concrete structures are finished, injecting water into the dock, then checking the water seepage and plugging treatment of the prefabricated structures in real time, and checking the bonding and flatness conditions of the bamboo plywood (3) at the bottom; and after the water levels inside and outside the dock are flush, the prefabricated concrete structure is carried to the installation position by adopting a tugboat for installation and construction.
2. The bottom die construction method for the precast concrete structure according to claim 1, wherein the top elevation of the crushed stone laid in the trench (2) in the step S2 is not higher than the top elevation of the floor concrete (1).
3. The bottom formwork construction method for the precast concrete structure according to claim 1, wherein in the step S3, the asphalt felt base paper (5) and the kraft paper (6) are laid in staggered joints.
4. The method for constructing the bottom formwork of the precast concrete structure according to claim 1, wherein the kraft paper (6) is repaired when the kraft paper (6) is found to be broken after the fireproof cloth (7) is drawn out in the step S5.
5. The precast concrete structure bottom die construction method according to claim 1, wherein in the step S6, when the bonding condition of the bamboo plywood (3) at the bottom is checked after the precast concrete structure floats, if the bamboo plywood (3) is bonded on the spot, the site needs to be cleaned in time.
6. The precast concrete structure bottom mold construction method according to claim 2, wherein the thickness of the bamboo plywood (3) laid in the step S2 is 1.5cm.
7. The bottom mold construction method of a precast concrete structure according to claim 1, wherein the concrete pads (8) are placed by positioning and paying off in the step S4, and the distance between the concrete pads (8) is 1m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211524270.3A CN115592800A (en) | 2022-12-01 | 2022-12-01 | Construction method for bottom die of precast concrete structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211524270.3A CN115592800A (en) | 2022-12-01 | 2022-12-01 | Construction method for bottom die of precast concrete structure |
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| CN115592800A true CN115592800A (en) | 2023-01-13 |
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| CN202211524270.3A Pending CN115592800A (en) | 2022-12-01 | 2022-12-01 | Construction method for bottom die of precast concrete structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09221761A (en) * | 1996-02-19 | 1997-08-26 | Maeda Corp | Caisson made of concrete and manufacture thereof |
| CN202689039U (en) * | 2012-05-25 | 2013-01-23 | 中铁十八局集团有限公司 | Grouting tube structure of immersed tube tunnel tube section |
| CN203066096U (en) * | 2012-12-27 | 2013-07-17 | 中交一航局第三工程有限公司 | Caisson bottom tire structure |
| CN207347943U (en) * | 2017-10-31 | 2018-05-11 | 重庆建工第十一建筑工程有限责任公司 | A kind of template of continuous rigid frame bridge closure section |
| CN109680720A (en) * | 2019-01-14 | 2019-04-26 | 中交第二航务工程局有限公司 | For the continuous prefabricated construction method of dry-docking immersed tube pipe joint section |
| CN110984259A (en) * | 2019-12-18 | 2020-04-10 | 中交一航局第三工程有限公司 | In-situ cast-in-place multi-time jacking method for dock gate caisson |
| CN112942428A (en) * | 2021-04-22 | 2021-06-11 | 中铁隧道勘测设计院有限公司 | Construction method of prestressed immersed tube tunnel pipe joint |
-
2022
- 2022-12-01 CN CN202211524270.3A patent/CN115592800A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09221761A (en) * | 1996-02-19 | 1997-08-26 | Maeda Corp | Caisson made of concrete and manufacture thereof |
| CN202689039U (en) * | 2012-05-25 | 2013-01-23 | 中铁十八局集团有限公司 | Grouting tube structure of immersed tube tunnel tube section |
| CN203066096U (en) * | 2012-12-27 | 2013-07-17 | 中交一航局第三工程有限公司 | Caisson bottom tire structure |
| CN207347943U (en) * | 2017-10-31 | 2018-05-11 | 重庆建工第十一建筑工程有限责任公司 | A kind of template of continuous rigid frame bridge closure section |
| CN109680720A (en) * | 2019-01-14 | 2019-04-26 | 中交第二航务工程局有限公司 | For the continuous prefabricated construction method of dry-docking immersed tube pipe joint section |
| CN110984259A (en) * | 2019-12-18 | 2020-04-10 | 中交一航局第三工程有限公司 | In-situ cast-in-place multi-time jacking method for dock gate caisson |
| CN112942428A (en) * | 2021-04-22 | 2021-06-11 | 中铁隧道勘测设计院有限公司 | Construction method of prestressed immersed tube tunnel pipe joint |
Non-Patent Citations (1)
| Title |
|---|
| 邵亚飞, 北京邮电大学出版社 * |
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